213113221 has 4 divisors (see below), whose sum is σ = 214195212. Its totient is φ = 212031232.

The previous prime is 213113179. The next prime is 213113231. The reversal of 213113221 is 122311312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102232321 + 110880900 = 10111^2 + 10530^2 .

It is a cyclic number.

It is not a de Polignac number, because 213113221 - 2¹⁷ = 212982149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213113195 and 213113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540700 + ... + 541093.

It is an arithmetic number, because the mean of its divisors is an integer number (53548803).

Almost surely, 2^213113221 is an apocalyptic number.

It is an amenable number.

213113221 is a deficient number, since it is larger than the sum of its proper divisors (1081991).

213113221 is a wasteful number, since it uses less digits than its factorization.

213113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081990.

The product of its digits is 72, while the sum is 16.

The square root of 213113221 is about 14598.3978915496. The cubic root of 213113221 is about 597.3150595613.

Adding to 213113221 its reverse (122311312), we get a palindrome (335424533).

The spelling of 213113221 in words is "two hundred thirteen million, one hundred thirteen thousand, two hundred twenty-one".